The activities of

(a) It is necessary to conserve our environment because of the following reasons:

(i) To save natural resources like air, water and soil from pollution which are for our survival.

(ii) To maintain ecological balance in nature.

(iii) The environment provides us fresh air to breathe, a number of useful products such as wood, paper, medicines, etc. The ozone layer of the environment also protects us from harmful ultraviolet radiations from the sun.

(b) Green dustbins are used for biodegradable wastes and blue dustbins are used for non-biodegradable wastes.

Importance of two types of dustbins:

(i) Disposal of wastes after separating them into biodegradable and non-biodegradable wastes in separate dustbins and treating wastes properly before dumping in landfills.

(ii) Segregation of biodegradable and non-biodegradable wastes occur without wasting time and energy.